Nine people were shot and wounded, one critically, in a Houston neighborhood Monday morning by a lawyer who had issues with his law firm, authorities said.

The first report of the shootings began about 6:30 a.m., police Chief Martha Montalvo said at a news conference, and when officers arrived, the suspect began firing at them.

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Police shot the man, whom Montalvo did not identify and who later died at the scene.

Numerous weapons were found at the scene, Montalvo said, and a bomb-squad robot is looking at a Porsche that is believed to have belonged to the gunman.

Mayor Sylvester Turner, who is in Cuba for a trade mission, told KTRK-TV that the lawyer was "disgruntled."

"He was either fired or had a bad relationship with this law firm," Turner said.

"The investigation is active. It's very, very early. We want to make sure there is no other gunman. We are checking every angle, I can assure you," Turner told the TV station.

Of the nine wounded, one is in critical condition, another is in serious condition and three people were treated and released, Montalvo said.

Some witnesses described the gunman firing dozens of shots at cars passing through the neighborhood. Several cars with bullet holes and shattered windows were in a nearby strip mall parking lot.

The shooting came days after a shooting at a Washington state mall that left five people dead. A 20-year-old man stabbed 10 people Sept. 17 at a Minnesota mall before being shot to death by an off-duty police officer.